My quad backfired and sheared off the flywheel key. When it did it really scored the rotor. I then replaced the rotor and installed a new key. After I put it all back together I tried starting her up. She started but ran sluggish then backfired and died. It would sound like it was trying to start but sometimes when I kicked it the lever kicked back up at me with a lot of force. I then started looking at electrical..I switched out the cdi, coil and run switch, nothing helped. I then pulled the rotor back off and started looking at the stator. Could it be causing the problems. It is stock so I don't thing the timing can be changed. Should I replace the whole thing or just the individual parts ie pulser or charge coil? I just don't know where to go next I think it must be a timing problem but not sure what to do.